Radioactive emission from high-index,optical glasses and atypical effects on CCDs

Michael L. Edgar; Ross Zhelem; Lewis Waller; Janez Kos; Don Mayfield; Naveen Pai; Andrew Sheinis; Gayandhi De Silva; Jeffrey Simpson; Nicholas Stazak

doi:10.1117/12.2307305

10 July 2018 Radioactive emission from high-index,optical glasses and atypical effects on CCDs

Michael L. Edgar, Ross Zhelem, Lewis Waller, Janez Kos, Don Mayfield, Naveen Pai, Andrew Sheinis, Gayandhi De Silva, Jeffrey Simpson, Nicholas Stazak

Author Affiliations +

Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 1070633 (2018) https://doi.org/10.1117/12.2307305
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

Large-amplitude anomalous events have been observed in CCDs due to radioactive emission from high-index optical glasses, some producing charge-trapping like artefacts. We have identified the source of these events from one glass (Ohara S-YGH51) as α-particles from trace amounts of nuclides in the actinium decay series, parent ²³⁵U. We present measurements of the anomalous event rate for samples of 15 separate optical glasses with n_d ≥ 1.6. There is a variation in anomalous count rates of orders of magnitude range over these materials. Care should be taken in the selection of optical glasses to be located in close proximity to detectors.

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Michael L. Edgar, Ross Zhelem, Lewis Waller, Janez Kos, Don Mayfield, Naveen Pai, Andrew Sheinis, Gayandhi De Silva, Jeffrey Simpson, and Nicholas Stazak "Radioactive emission from high-index,optical glasses and atypical effects on CCDs", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 1070633 (10 July 2018); https://doi.org/10.1117/12.2307305

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